Section-liner.



G. B. BEAUMONT.

SECTION LINER.

APPLICATION FILED 020.15.1915.

Patented Dec. 12, 1916.

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G. 8. BEAUMONT.

SECTION LINER.

APPLICATION FILED DEC.I6. m5.

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SECTION-LINER.

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Specification of Letters Patent.

Patented Dec. 12, 191 5.

Application filed December 16, 1915. Serial No. 67,167.

To all whom it may concern:

Be it known that I, GEORGE Buss BEAU- MONT, a subject of the King ofGreat Britain, and. resident of Moncton. in the Province of NewBrunswick, Dominion of Canada, have invented certain new and usefulImprovements in Section-Liners, of which the following is thespecification.

This invention relates to improvements in section liners particularlyadapted for the use of draftsmen and the objects of the invention are tofacilitate in adjusting the section liner whereby the spacing of sectionlines may be made to any degree of fineness and to permit of the spacerbeing utilized on large drawings without the necessity of pinning thesame to the board.

Further objects are to simplify the construction and render the severalparts better adapted to perform the functions required of them.

With the above and other objects in view the invention consistsessentially of the improved construction particularly described and setforth in the following specification and accompanying drawings formingpart of the same.

In the drawings, Figure 1 is a plan view of the improved section liner.Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1. Fig. 3 is atransverse section through the center of the section liner. Fig. 4 is atransverse section through the line 3-3 of Fig. 1. Fig. 5 is atransverse section through the line 44 of Fig. 1. Fig. 6 is a plandetail of the pawl coacting with the ratchet shown in Fig. 1.

Like characters of reference refer to like parts in the several figures.

Referring to the drawings, A represents the improved section linercomprising the plate 1 carrying a rack 2 and having a longitudinallyextending 'cleat strip 3 mounted thereon with which the carriage 4slidably engages. The carriage is provided with a leaf spring 5 designedto coact with the tractor 10 which makes sliding engagement with thecurvilinear guide 11 carried by the carriage 4, and to facilitate insetting or reading angles with greater accuracy the curvilinear guide isprovided with a vernier 12 coiiperating with the protractor 10 therebypermitting of a closer degree of accuracy being obtained in thisoperation.

The ruler is capable of being rotated through 180 and to obtain thisdesired result the carriage 4 is provided with a curvilinear slot 13 ofa substantial quadrant of a circle adapted to register with asimilarslot 13 provided in the ruler 7 with which slots the thumb screw llengages.

The means by which the adjustment of the section liner is accomplishedis quite unique and consists of a plate 15 having a curvilinear edgeprovided with a plurality of serrations 16 therein. the said plate beingconcentrically pivoted by means of the pin 17 to the carriage 4 andprovided with a leaf spring 18 operatively connected to the button 19which is provided on its under face with a tooth 20 adapted to engagewith a plurality of teeth or slots 21 integral with the under side ofthe curvilinear edge at that end of the guide 11 remote from the vermer.

It will. be understood that the plate 15 is capable of pivotal movementthrough the medium of the button 19 which may be manually depressedwhereupon when the said plate is rotated the tooth 20 may be engagedwith one of the teeth or slots 21 on the bottom of the curvilinear guide11 and simultaneously with this movement the pointer 22 operativelysupported by the button 19 is caused to register with the scale 23engraved on the carriage 4:.

The plate 15 is designed to control the movement of the carriage 4: andis adapted to coact with a stop member 2 1 operatively mounted on thelower end of the crank lever l 25 pivotally mounted on the standards 26carried by the carriage, the front end of the stop member 24 makingsliding engagement with the guide member 28 operatively supported by oneof the standards. This crank lever 25 is normally retained in aretracted position by the leaf spring 27 secured at the upper end to thestandards 26, the other end fitting into a notch in the lower end of thesaid lever.

When the upper end of the lever 25 is depressed the stop member 24:engages with one of the serrations 16 in the plate therefby limiting themotion of the crank lever while at the same time the pawl 29 pivotallymounted on the lower end of the crank lever '25 adjacent to the stopmember 2lis oper ated in a longitudinal direction to engage with theteeth of the rack2 in a manner to be made clear hereafter.

. 31 and one of the teeth 30 of the pawl 29 is brought into engagementwith a corresponding tooth of the rack 2 through the medium of the leafspring 33 mounted at one end on the carriage 4 and adapted to engage atthe otherend with the back of the said pawl.

It is desirable that whenthe section liner is placed upon a drawing thatit should not be inadvertently displaced, and to obtain this desiredresult a rubber strip or base 34 is suitably secured to the lower faceof the plate 1 thereby obviating any tendency to slip which mightotherwise occur, and at the same time dispensing with the use of thumbtacks'or-protruding points on the base of plate 1 which in many caseswould deface or mutilate the surface of the drawing.

The ruler 7 may be provided with a celluloid ruling strip 35 whichpermits of the draftsman seeing which part of the drawing is adjacent tothe ruler so that there is no tendency of section lining parts whichwould otherwise be left clear.

To facilitate in obtaining the inclination of intersecting lines, thepoint of intersection of the hair lines 9 is placed on the point ofintersection of the two lines, the magnitude of whose inclosed angle itis desired to determine or find. The celluloid strip 37 carried by thecarriage 4 is then made to coincide with oneof the lines when the ruler7 is swung into position so that the outer edge of the celluloid rulingstrip 35 will coincide with the other line on the paper, the ruler 7 isnow clamped by the thumb screw 1% and the angle of intersection read bymeans of the Vernier 12 and the curvilinear protractor 10. i v v By asimilar operation it will be clear thatthe line may be drawn at anyangle to a given line through a given point.

r The assembly of the liner will be readily understood from theforegoing description.

' When the liner is in commission it is placed on the drawings whereuponthe rubber base 34: will adhere to the surface of the paper and thedraftsman may then adjust the plate 15 so that the desired spacingbetween consecutive section lines is obtained. The ruler 7 is set at thedesired degree of inclination when the section liner A is in conditionto be used. It is only necessary now in starting the sectioning todepress the crank lever 25 after each line is drawn, which will resultin one of the teeth 30 engaging with one of the teeth of the rack 2 andtransmit longitudinal movement of the carriage l along the cleat strip3.

To permit of the movement of the carriage being as finely gaged aspossible only one of the teeth 30 of the pawl 29 is adapted at one timeto engage with the teeth of the rack 2, and it will be understood thatwhen this tooth is engaged with the rack the other tooth is staggeredrelatively to the teeth of the rack and does not engage therewith sothat a very fine adjustment will cause the second tooth to engage therack and so disengage the first tooth from engagement therewith and inthis way a very limited movement of the carriage 1 of the liner can beobtained.

Should it be found desirable to alter the spacing in any way it is onlynecessary to depress the button 19 to disengage the tooth 20 from thecoacting teeth or slots 21 on the curvilinear guide 11 whereupon theplate 15 is rotated and a new position taken up and the stop member 24engages with one of the other serrations or teeth 16 permitting of alonger or shorter travel of the crank lever 25 and consequently of thepawl 29 coacting therewith.

By the use of the spring 5 it will also be seen that there is notendency for the carriage 4 unduly slipping as this is obviated by thefrictional contact of the end of the spring with the plate 1.

As many changes could be made in the above construction and manyapparently widely different embodiments of my invention, within thescope of the claims, constructed without departing from the spirit orscope thereof, it is intended that all matter contained in theaccompanying specification and drawings shall be interpreted asillustrative and not in a limiting sense.

What I claim as my invention is:

1. In a section liner of the class described and in combination, acarriage, a plate pivotally mounted thereon provided with a curvilinearedge having a plurality of serrations therein, a crank lever pivotallysupported from the carriage, a stop member on the crank lever coactingwith the serrations on the pivotally mounted plate, a rack, and a pawlhaving a plurality of teeth operatively connected to the crank lever andadapted to coact with the rack.

2. In a section liner of the class described and in combination, acarriage, a ruler pivotally mounted thereon, a curvilinear protractoroperatively engaging the ruler, a curvilinear guide slidably engagingwith the protractor, a Vernier on the guide coacting with theprotractor, and means for moving the carriage a predetermined distanceafter each operation of section lining.

3. In a section liner of the class described and in combination, acarriage, a plate pivotally mounted on the carriage provided with acurvilinear edge having a plurality of serrations therein, resilientmeans for adjusting the said plate, a stop member coacting with theplate, and means for moving the carriage through a predetermineddistance after each operation of section lining.

4:. In a'section liner of the class described,

and in combination, a rack, a carriage, a

pawl slidably mounted on the carriage provided with a pair of teeth anda cam face, a clearance pin designed to engage the cam face, means foractuating the pawl and rea resilent member operatively connected to theplate provided with a tooth engaging the said serrations, a stop membercoacting with the plate, a rack, a pawl coacting with the rack and meansfor simultaneously operating the pawl and stop member.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

GEORGE BLISS BEAUMONT.

Witnesses:

T. P. MURPHY, JEAN M. MATTHEWS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

